Error for insert header.

[niquenen]

Hi,

When I have a directory ".git" in my project the plugin return a console error and can't insert header.
The problem come from the file FileHeader.py (l.220).
https://github.com/shiyanhui/FileHeader/blob/528b71855bef7c6f42d59d4e46d3e06f0e8ab363/FileHeader.py#L220
If the line is comment the plugin work correctly :

if not error:
        #output, error = getOutputError('git config --get user.name')
        if not error and output:
                user = output
return user

[fanser]

Your solution can fix this problem. but, whether has another better way ?